Bar rolling interval duration control method and related equipment

Abstract

The invention discloses a bar rolling interval duration control method and related equipment, and relates to the technical field of metallurgical production, and the method comprises the steps that the actual rolling interval duration of each detection point in a rough and intermediate rolling area is obtained; based on the actual rolling interval duration and the preset minimum rolling interval duration, a trigger signal is generated; based on the trigger signal and a preset rising edge signal, the target flying shear is controlled to execute breaking operation; and based on the actual rolling interval duration of the broken target detection point and the preset minimum rolling interval duration, a reset signal is generated to control the target flying shear to stop breaking operation. According to the method, automatic detection and processing of the abnormal rolling interval are achieved, manual intervention is not needed, and response lag and yield loss caused by manual operation are avoided. And meanwhile, through timely starting and resetting of flying shear breaking, it is ensured that the rolling interval always meets the action response requirement of downstream equipment, and the production line efficiency and the yield are improved on the premise that the rolling rhythm is kept.

Description

Technical Field

[0001] The present application relates to the field of metallurgical production technology, and in particular to a method for controlling the interval length of rolling of a bar and related equipment. Background Art

[0002] The rolling interval is a key parameter for improving the output of the bar production line, and a shorter rolling interval can improve production efficiency. However, in the actual rolling process, due to problems such as billet slippage, abnormal transport rollers, or tension fluctuations between racks, the actual rolling interval may be less than the set value, resulting in steel accumulation accidents in the downstream looper and flying shear equipment due to insufficient response time. At present, manual intervention or redundant time setting is used in China to deal with such problems. Manual intervention relies on real-time monitoring by operators and manual triggering of flying shear breaking, which has problems such as delayed response and low operating accuracy, and is prone to steel accumulation or loss of yield; and although increasing redundant time can reduce the risk of steel accumulation, it will sacrifice production line efficiency and make it difficult to balance the contradiction between output and stability. Therefore, there is an urgent need for a method to control the length of the rolling interval of bars to solve the above-mentioned technical problems. Summary of the invention

[0003] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to limit the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0004] In a first aspect, the present application provides a method for controlling a rolling interval length of a bar, the method comprising:

[0005] Obtain the actual rolling interval duration of each detection point in the roughing and intermediate rolling area;

[0006] Generate a trigger signal based on the actual rolling interval duration and the preset minimum rolling interval duration;

[0007] Based on the trigger signal and the preset rising edge signal, the target flying shear is controlled to perform the breaking operation;

[0008] Based on the actual rolling interval duration of the target detection point after breaking and the preset minimum rolling interval duration, a reset signal is generated to control the target flying shear to stop the breaking operation, wherein the target flying shear is flying shear No. 2 and the target detection point is the detection point after the target flying shear.

[0009] In some embodiments, obtaining the actual rolling interval duration of each detection point in the roughing and intermediate rolling area includes:

[0010] Based on the rising edge trigger points of each detection point in the rough and intermediate rolling area, determine the first arrival time of each detection point, where the detection points include the stand biting positions and the hot metal detector positions;

[0011] Based on the falling edge trigger points of each detection point in the rough and intermediate rolling area, determine the second departure time of each detection point;

[0012] Based on the difference between the first arrival time and the second departure time, calculate the passing time of the billet at each detection point;

[0013] Take the absolute value of the passing time to determine the actual rolling interval duration of each detection point.

[0014] In some embodiments, based on the actual rolling interval duration and the preset minimum rolling interval duration, generate a trigger signal, including:

[0015] Compare the actual rolling interval duration of each detection point with the preset minimum rolling interval duration respectively;

[0016] When there is at least one detection point whose actual rolling interval duration is less than the preset minimum rolling interval duration, generate a trigger signal.

[0017] In some embodiments, based on the trigger signal and the preset rising edge signal, control the target flying shear to perform a breaking operation, including:

[0018] Based on the logical relationship between the trigger signal and the rising edge signal of the hot metal detector in front of the target flying shear, determine the breaking start condition of the target flying shear;

[0019] Based on the breaking start condition, generate a breaking control instruction;

[0020] Based on the breaking control instruction, control the target flying shear to perform a breaking operation to cut off the head of the billet.

[0021] In some embodiments, based on the actual rolling interval duration of the target detection point after breaking and the preset minimum rolling interval duration, generate a reset signal to control the target flying shear to stop the breaking operation, including:

[0022] Compare the actual rolling interval duration of the target detection point after breaking with the preset minimum rolling interval duration;

[0023] When the actual rolling interval duration of the target detection point after breaking is greater than the preset minimum rolling interval duration, generate a reset signal;

[0024] Based on the reset signal, generate a breaking stop instruction;

[0025] Based on the breaking stop instruction, control the target flying shear to stop the breaking operation and resume the rolling process.

[0026] In some embodiments, it further includes:

[0027] Calculate the minimum safe distance from the entrance of the rear guide groove of the target flying shear to the center line of the flying shear blade according to the line speed of the rolling mill upstream of the target flying shear, the forward slip coefficient, and the swing time of the switch;

[0028] If the actual distance between the entrance of the rear guide groove of the target flying shear and the center line of the flying shear blade is less than the minimum safe distance, keep the switch in the breaking position until the head of the billet passes through the entrance of the rear guide groove of the target flying shear, and then control the switch to swing to the rolling position.

[0029] In some embodiments, the minimum safe distance is determined based on the following formula, expressed as:

[0030] L = V·s·t + T cor

[0031] Wherein, L is the minimum safe distance; V is the line speed of the rolling mill upstream of the target flying shear; s is the forward slip coefficient; t is the swing time of the switch; T cor Is a preset distance compensation value.

[0032] In a second aspect, a control device for the bar rolling interval duration of the present application includes:

[0033] A rolling data acquisition unit for acquiring the actual rolling interval duration of each detection point in the rough and medium rolling areas;

[0034] A trigger signal generation unit for generating a trigger signal based on the actual rolling interval duration and the preset minimum rolling interval duration;

[0035] A breaking operation execution unit for controlling the target flying shear to perform a breaking operation based on the trigger signal and the preset rising edge signal;

[0036] A breaking operation stop unit for generating a reset signal to control the target flying shear to stop the breaking operation based on the actual rolling interval duration of the detection point after breaking and the preset minimum rolling interval duration, wherein the target flying shear is the No. 2 flying shear, and the target detection point is the detection point after the target flying shear.

[0037] In a third aspect, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor is used to implement the steps of the control method for the bar rolling interval duration according to any one of the first aspects when executing the computer program stored in the memory.

[0038] In a fourth aspect, the present application proposes a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the control method for the bar rolling interval duration according to any one of the first aspects.

[0039] In summary, the present application automatically generates a trigger signal and a reset signal by obtaining the actual rolling interval durations at multiple detection points in the rough and medium rolling areas and dynamically comparing them with a preset minimum rolling interval, and precisely controls the breaking operation of the target flying shear. The present application realizes the automatic detection and processing of abnormal rolling intervals without manual intervention, avoiding response lag and yield loss caused by manual operation. At the same time, by starting and resetting the flying shear breaking in a timely manner, it is ensured that the rolling interval always meets the action response requirements of downstream equipment, effectively improving the production line efficiency and yield while maintaining the rolling rhythm.

[0040] The control method for the bar rolling interval duration proposed in the present application. Other advantages, objectives, and features of the present application will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to limit this specification. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0042] Figure 1 It is a schematic flow chart of the control method for the bar rolling interval duration provided by the embodiment of the present application;

[0043] Figure 2 It is a schematic layout structure diagram of rough, medium, and pre-finishing rolling provided by the embodiment of the present application;

[0044] Figure 3 It is a schematic structure diagram of the control device for the bar rolling interval duration provided by the embodiment of the present application;

[0045] Figure 4 It is a structural diagram of the electronic device for controlling the bar rolling interval duration provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] In the description and claims of this application and the above-mentioned drawings, terms such as "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments.

[0047] Please refer to Figure 1 , which is a schematic flow chart of a method for controlling the rolling interval time of bar materials provided by an embodiment of this application, and specifically may include:

[0048] S110. Obtain the actual rolling interval time of each detection point in the rough and medium rolling area;

[0049] Exemplarily, during the bar rolling process, multiple detection points are arranged in the rough and medium rolling area. By capturing the rising edge signal of the billet head reaching the detection point and the falling edge signal of the tail leaving in real time, the trigger time is recorded. These signals are scanned and collected by the PLC system at a fixed period (such as 100 ms) to ensure the continuity and timeliness of the time data.

[0050] Based on the rising edge and falling edge trigger times of each detection point, calculate the total time for the billet to pass through this detection point (i.e., the difference between the tail leaving time and the head reaching time), and perform an absolute value process on the time difference to eliminate the timer overflow error. Through the parallel acquisition and calculation of multi-point data, the actual rolling interval time of each detection point is output, providing basic data for subsequent abnormal determination.

[0051] S120. Generate a trigger signal based on the actual rolling interval time and the preset minimum rolling interval time;

[0052] Exemplarily, the actual rolling interval time of each detection point is compared with the preset minimum rolling interval time in real time. If the actual time of any detection point is less than the preset value, it is determined that the current rolling interval is too short and an abnormal state is triggered.

[0053] By comparing the parallel data of multiple detection points in the rough and medium rolling areas, the system can avoid misjudgment caused by accidental errors (such as billet slippage, signal interference) at a single detection point, ensuring that the generation of trigger signals is global and reliable.

[0054] S130, based on the trigger signal and the preset rising edge signal, controlling the target flying shear to perform a breaking operation;

[0055] For example, the triggering of the breaking operation needs to be combined with the abnormal rolling interval signal and the real-time feedback of the billet reaching the key position before the flying shear. When the system generates a trigger signal (i.e., there is a short rolling interval) and the hot metal detector before the target flying shear detects the rising edge signal of the billet head, the two form a logical "and" relationship to ensure that the breaking operation is only started when the billet actually reaches the preset position and the interval is abnormal. This mechanism avoids invalid breaking due to signal misjudgment or the billet is not in place.

[0056] Through the above-mentioned coordinated control, the breaking operation is precisely applied to the head of the billet, which not only cuts off the abnormally spaced billets in time to prevent downstream steel accumulation, but also minimizes the loss of yield by limiting the breaking position (such as No. 2 flying shear). The strict matching of logical conditions ensures the reliability and timeliness of the breaking operation, and ensures the continuity and stability of the rolling process.

[0057] S140. Based on the actual rolling interval duration of the target detection point after breaking and the preset minimum rolling interval duration, a reset signal is generated to control the target flying shear to stop the breaking operation, wherein the target flying shear is flying shear No. 2 and the target detection point is the detection point after the target flying shear.

[0058] Exemplarily, the generation of the reset signal is achieved by real-time monitoring of the rolling interval duration of the target detection point (i.e., the hot metal detector after the No. 2 flying shear) after the breaking operation. When the actual interval duration after breaking exceeds the preset minimum rolling interval duration, it indicates that the rolling interval has returned to a safe range, and a reset signal is automatically generated to terminate the breaking operation. This mechanism ensures that the breaking only occurs during necessary periods to avoid yield loss caused by excessive breaking. The target detection point is located downstream of the No. 2 flying shear, and its interval data directly reflects the breaking effect and the response status of the downstream equipment. By dynamically comparing the actual interval with the preset threshold, the reset signal accurately controls the timing of the flying shear stop, ensuring that the rolling process is restarted immediately after the interval returns to normal, thereby maintaining the continuity and efficiency of the production line.

[0059] See also Figure 2, which is a schematic diagram of the rough, medium and pre-finishing rolling layout structure provided in the embodiment of the present application. The billet rolling route of the bar production line includes rough rolling, No. 1 flying shear, medium rolling, No. 2 flying shear, pre-finishing rolling and finishing rolling in sequence. In the rough rolling stage, the billet is initially deformed to form an intermediate billet with a larger cross-sectional size; then the billet enters the medium rolling area after the head and tail are cut off or abnormally broken by the No. 1 flying shear to further refine the material shape; the billet after the medium rolling enters the pre-finishing and finishing rolling stages through the No. 2 flying shear, and finally forms a finished product of target specifications. The billets are transported between the frames by rollers, and the stability of the rolling interval directly affects the production efficiency and yield rate.

[0060] In the actual rolling process, the billet may slip due to insufficient friction when biting into the rolling mill, or deviate on the transport roller due to speed fluctuations, resulting in the actual rolling interval between adjacent billets being less than the set value. In addition, since there is no looper device in the roughing and intermediate rolling area, it only relies on fixed micro-tension control and cannot dynamically adjust the tension between the racks, further exacerbating the random fluctuations in the rolling interval. When the actual interval is too short, the looper and flying shear equipment in the downstream pre-finishing or finishing rolling area are prone to steel accumulation accidents due to insufficient action response time.

[0061] In the traditional solution, the No. 1 flying shear is located close to the rough rolling area, and the steel billet is larger during breaking, resulting in a significantly higher breaking volume than the No. 2 flying shear, resulting in a greater loss in yield rate. However, manual intervention in the breaking operation has problems such as delayed response and inaccurate timing control. It may cause steel accumulation due to breaking too late, or stop too early, resulting in ineffective breaking. Although the existing technology can partially avoid risks by adding redundant time settings, it will sacrifice rolling efficiency and make it difficult to balance production and stability requirements.

[0062] In summary, in the embodiment of the present application, by collecting the rolling interval data of multiple detection points in the rough and medium rolling area, and dynamically comparing it with the preset minimum rolling interval, trigger signals and reset signals are automatically generated to accurately control the start and stop timing of the target flying shear. The present application adopts multi-point detection logic to ensure the comprehensive capture of rolling interval anomalies, and combines the real-time rising edge signal of the key position before the billet arrives at the flying shear, triggering the breaking only when the interval is too short and the billet is in place to avoid invalid operation. The flying shear is dynamically reset by the interval data of the downstream detection point after breaking, ensuring that the rolling process is restarted immediately after the safe interval is restored, reducing the amount of breaking and the loss of yield. At the same time, the guide groove safety distance is calculated based on the rolling mill line speed, the forward slip coefficient and the swing time of the switch to prevent the abnormal introduction of the billet head after breaking, and further reduce the risk of steel piling. Compared with manual intervention or redundant time setting, the present application reduces the breaking ratio from 100% to 0.8%-1.3% under the premise of maintaining the rolling rhythm, and the single processing time is shortened by about 2 minutes, achieving an efficient balance between production efficiency and yield.

[0063] In some examples, obtaining the actual rolling interval duration of each detection point in the roughing and intermediate rolling area includes:

[0064] Based on the rising edge trigger points of each detection point in the rough and medium rolling area, determine the first arrival time of each detection point, where the detection points include the rolling bite points of the stands and the hot metal detector points;

[0065] Based on the falling edge trigger points of each detection point in the rough and medium rolling area, determine the second departure time of each detection point;

[0066] Based on the difference between the first arrival time and the second departure time, calculate the passing time of the billet at each detection point;

[0067] Perform absolute value processing on the passing time to determine the actual rolling interval duration of each detection point.

[0068] Exemplarily, at each detection point in the rough and medium rolling area (including the rolling bite points of the stands and the hot metal detector points), the arrival signal of the billet and the departure signal of the tail are captured in real time by sensors. Specifically, when the head of the billet enters the detection area, a rising edge signal is triggered, and this moment is recorded as the first arrival time T1; when the tail of the billet completely leaves the detection area, a falling edge signal is triggered, and this moment is recorded as the second departure time T2. The above signals are collected by the PLC system at a preset fixed scan period (such as 100 ms) to ensure the continuity and timeliness of the time stamps. The rolling bite signal of the stand is generated by the pressure sensor in the rolling bite area of the rolling mill, while the hot metal detector generates signals based on the infrared induction principle of the high-temperature radiation of the billet. The two work together to cover multiple key detection points in the rough and medium rolling area.

[0069] Based on the first arrival time and the second departure time, calculate the passing time of the billet at a single detection point, expressed as:

[0070] Δt = |T2 - T1|

[0071] where Δt is the passing time; the absolute value processing is used to eliminate the timing overflow error that may be caused by the periodic reset of the PLC timer (for example, reset once every 10 days) to ensure the accuracy of the time difference calculation. The passing time Δt directly represents the actual rolling interval duration of the whole billet passing through the detection point.

[0072] Arrange multiple detection points in the rough and medium rolling area. By parallelly collecting the rising edge and falling edge signals of each point, calculate the passing time Δt of each detection point respectively. Since there is no loop device configured in the rough and medium rolling area, the billet may have interval repeatability deviation during rolling due to steel temperature fluctuation, front slip coefficient change or micro-tension instability. Multi-point detection can cover the interval changes of different stands and transportation sections, avoiding data distortion caused by local anomalies at a single detection point, thereby improving the overall detection accuracy.

[0073] After summarizing and logically verifying the passing time Δt of each detection point, the actual rolling interval duration of each detection point is output. The actual rolling interval duration is used as the core input parameter for subsequent trigger signal generation to dynamically determine whether the rolling interval is too short. Through the collaborative processing of multi-point data, abnormal rolling intervals can be comprehensively captured, providing a reliable data basis for automatic break control.

[0074] In some instances, based on the actual rolling interval duration and the preset minimum rolling interval duration, a trigger signal is generated, including:

[0075] The actual rolling interval duration of each detection point is respectively compared with the preset minimum rolling interval duration;

[0076] When the actual rolling interval duration of at least one detection point is less than the preset minimum rolling interval duration, a trigger signal is generated.

[0077] Exemplarily, after collecting the actual rolling interval duration at multiple detection points (including the rolling bite point and the hot metal detector point) arranged in the rough and medium rolling regions, the actual values of each detection point are dynamically compared with the preset minimum rolling interval duration. The preset minimum rolling interval duration is determined according to the action response time of the downstream loop and the high-speed flying shear. For example, if the downstream equipment needs at least 1.5 seconds to complete the action, the preset minimum interval duration is 1.5 seconds. Through multi-point parallel comparison, the interval fluctuations at different positions in the rough and medium rolling regions can be covered, avoiding misjudgment caused by abnormal data at a single detection point (such as local billet slipping or signal interference), and ensuring the global and reliable determination of the trigger condition.

[0078] A logical "OR" operation is performed on the comparison results (whether the actual value is less than the preset value) of each detection point, that is, as long as the actual rolling interval duration of one detection point is less than the preset minimum rolling interval duration, a trigger signal is immediately generated. This design is based on the characteristics of no loop device and unstable tension control in the rough and medium rolling regions, ensuring that any abnormal interval in a local area can be captured in time. The logical "OR" relationship significantly reduces the risk of missed judgment, preventing overall detection failure caused by the failure of a certain detection point or data deviation, thus ensuring the safety of the downstream pre-finishing and finishing equipment.

[0079] In some instances, based on the trigger signal and the preset rising edge signal, the target flying shear is controlled to perform a breaking operation, including:

[0080] Based on the logical relationship between the trigger signal and the rising edge signal of the hot metal detector in front of the target flying shear, the breaking start condition of the target flying shear is determined;

[0081] Based on the breaking start condition, a breaking control instruction is generated;

[0082] Based on the breaking control instruction, the target flying shear is controlled to perform a breaking operation to cut off the head of the billet.

[0083] Exemplarily, the start of the breaking operation needs to meet two conditions at the same time: one is the trigger signal generated by the system (that is, the actual rolling interval of at least one detection point is less than the preset minimum value), and the other is that the hot metal detector before the target flying shear captures the rising edge signal of the billet head. The trigger signal represents the abnormal state of too short rolling interval, and the rising edge signal indicates that the billet head has reached the preset position before the flying shear. The two are coordinated through the logical "and" relationship. Only when the two are established at the same time, the system determines that the breaking start condition is met. For example, if the actual interval length of a certain detection point is 1.2s (less than the preset 1.5s) and the hot metal detector detects the arrival signal of the billet head, the breaking is triggered; if only the interval is abnormal but the billet is not in place, the operation is not performed. This design effectively avoids false triggering and ensures that the breaking operation is only started when necessary. This double verification mechanism ensures that the breaking operation is only triggered when the rolling interval is abnormal and the billet actually reaches the key position before the flying shear, avoiding invalid breaking caused by signal misjudgment or billet not in place, thereby accurately controlling the breaking timing.

[0084] When the breaking start conditions are met, the PLC system generates a breaking control instruction and sends the instruction to the control module of the target flying shear through a preset communication protocol (such as industrial Ethernet or fieldbus). The breaking control instruction contains parameters such as breaking position, shearing amount and execution time. The breaking position is limited to the head of the billet, and the shearing amount is dynamically adjusted according to the process parameters of the target flying shear (such as shear blade stroke and breaking speed) to ensure that the removal amount accounts for 0.8%-1.3% of the total weight of the billet. During the instruction generation process, the subsequent steel tapping signal is synchronously shielded to prevent interference caused by new billets entering the flying shear area during the breaking period.

[0085] After the target flying shear receives the breaking control command, it drives the shear blade to perform the shearing action and cut off the abnormal part of the billet head. The breaking operation is based on the synchronous control of the base speed of the flying shear and the linear speed of the billet to ensure the continuous movement of the billet during the shearing process and avoid uneven cuts or secondary damage caused by speed mismatch. After the breaking is completed, the breaking effect is monitored in real time, and a reset signal is generated through the rolling interval data of the detection point after the target flying shear to terminate the breaking operation and resume the rolling process. By selecting No. 2 flying shear as the execution equipment, its position is located at the junction of intermediate rolling and pre-finishing rolling, with a smaller material type and high breaking efficiency, it reduces the loss of yield rate compared to No. 1 flying shear, while avoiding the risk of downstream steel piling caused by delayed breaking.

[0086] In some examples, based on the actual rolling interval duration of the target detection point after breaking and the preset minimum rolling interval duration, a reset signal is generated to control the target flying shear to stop the breaking operation, including:

[0087] Compare the actual rolling interval time of the target detection point after breaking with the preset minimum rolling interval time;

[0088] When the actual rolling interval duration of the target detection point after breaking is greater than the preset minimum rolling interval duration, a reset signal is generated;

[0089] Based on the reset signal, a breaking stop instruction is generated;

[0090] Based on the breaking stop instruction, control the target flying shear to stop the breaking operation and resume the rolling process.

[0091] Exemplarily, after the breaking operation, continuously monitor the actual rolling interval duration of the target detection point (i.e., the hot metal detector after the No. 2 flying shear), and compare it with the preset minimum rolling interval duration in real time. The preset minimum rolling interval duration is determined by the action response time of the downstream loop and the high-speed flying shear, such as the sum of the loop filling time and the flying shear reset time. When the actual interval duration exceeds the preset value (for example, the detection duration after breaking is 1.8 s and the preset value is 1.5 s), it indicates that the breaking operation has effectively restored the rolling interval to a safe range. A reset signal is generated to terminate the breaking action. The target detection point is located downstream of the No. 2 flying shear, and its data directly reflects the actual restoration state of the rolling interval after breaking, ensuring the real-time and accuracy of the reset determination.

[0092] The generation of the reset signal is based on the periodic scanning (such as a 100 ms period) of the PLC system for the data of the target detection point. When the actual rolling interval duration continuously exceeds the preset minimum rolling interval for a set threshold (for example, continuously satisfying the condition for 3 scanning periods), confirm that the interval has been restored stably and generate a reset signal. The threshold setting is used to eliminate instantaneous fluctuation interference (such as slight slippage of the billet or signal noise) to avoid false triggering. The reset signal is output through a logic circuit or software algorithm and synchronized with the communication interface of the flying shear control module to ensure the reliability and timeliness of signal transmission.

[0093] Based on the reset signal, the PLC system generates a breaking stop instruction and sends it to the control unit of the target flying shear (No. 2 flying shear) through a preset protocol. The instruction contains parameters such as the stop position and the shear blade reset speed to ensure that the shear blade is precisely synchronized with the billet traveling speed during the stop process of the flying shear, avoiding shear residues or secondary damage. At the same time, lift the shielding of the subsequent steel discharging signal to allow a new billet to enter the rolling process. The execution of the breaking stop instruction is responded to in real time by the flying shear servo driver, driving the shear blade to retract to the initial position and resetting the switch to the rolling position to ensure the continuity and stability of the rolling path.

[0094] After the breaking operation is terminated, the recovery status of the rolling interval is monitored in real time, and the action response of the downstream equipment (such as pre-finishing looper) is verified to be normal. If the actual interval duration of the target detection point meets the preset requirements, it is determined that the rolling process has completely returned to normal, and the production line enters the continuous rolling mode. Through the automatic reset mechanism, the impact of the breaking operation on the yield rate is strictly controlled within the range of 0.8%-1.3%, and the processing time for each time is shortened by about 2 minutes compared to manual operation. In addition, the reset signal links the guide groove safety distance control logic to ensure that the head of the billet is accurately introduced into the guide groove after the switch swings to the rolling position, avoiding the risk of steel piling due to path deviation, and further improving the safety and efficiency of the production line.

[0095] In some examples, it also includes:

[0096] According to the linear speed, forward slip coefficient and switch swing time of the upstream rolling mill of the target flying shear, the minimum safe distance from the entrance of the rear guide groove of the target flying shear to the center line of the target flying shear blade is calculated. The minimum safe distance is determined based on the following formula and is expressed as:

[0097] L=V·s·t+T cor

[0098] Where L is the minimum safety distance; V is the linear speed of the rolling mill upstream of the target flying shear; s is the forward slip coefficient; t is the swing time of the switch; T cor is the preset distance compensation value;

[0099] If the actual distance between the target flying shear rear guide groove entrance and the target flying shear blade centerline is less than the minimum safety distance, keep the switch in the breaking position until the billet head passes through the target flying shear rear guide groove entrance, then control the switch to swing to the rolling position.

[0100] For example, the minimum safe distance L from the entrance of the guide groove to the center line of the shear blade after the target flying shear is calculated by the formula L = V·s·t+T cor Wherein, V is the linear speed of the rolling mill upstream of the target flying shear, which represents the traveling speed of the billet during the rolling process; s is the forward slip coefficient, which reflects the speed gain of the billet due to the friction of the rolls; T is the time required for the switch to swing from the breaking position to the rolling position, ensuring that the timing of the switch action matches the movement of the billet; cor It is a preset distance compensation value used to correct process layout or equipment installation errors. By dynamically calculating L, the minimum distance between the guide groove entrance and the shear blade centerline can be set to ensure that the billet head is normally introduced into the guide groove after the switch completes the swing, avoiding the risk of steel piling due to insufficient distance.

[0101] If the actual distance between the entrance of the rear guide chute of the target flying shear and the center line of the shear blade is less than the calculated minimum safe distance L, the forced switch will be kept in the breaking position (i.e., it is prohibited from swinging to the rolling position). At this time, the position of the billet head is continuously monitored until it passes through the entrance of the guide chute, and then the switch is allowed to perform the swinging action. This control logic is achieved by the PLC system collecting the billet position signals (such as the data of the hot metal detector or the encoder), ensuring that the action of the switch is strictly synchronized with the movement of the billet. This mechanism effectively prevents the deviation of the billet head from the path caused by insufficient distance at the guide chute entrance or premature swinging of the switch, ensuring the continuity and safety of the rolling process.

[0102] By dynamically calculating the minimum safe distance and combining the action control of the switch, this application solves the problem of path deviation of the billet head introduced into the guide chute after breaking. The traditional fixed distance setting cannot adapt to the dynamic changes of the rolling speed or the front slip coefficient, which is prone to steel piling up. However, this application makes the safe distance automatically adjusted with the process parameters by introducing variables such as the linear velocity, the front slip coefficient, and the swinging time of the switch, adapting to different production conditions. At the same time, the introduction of the preset distance compensation value further enhances the fault tolerance of the system to equipment installation errors or mechanical wear. Without the need to modify the existing guide chute structure, this design improves the stability and reliability of the rolling path after breaking, providing technical guarantee for the efficient operation of the production line.

[0103] The technical solution of this application will be further described in detail through specific embodiments below.

[0104] In the common bar production line, the theoretical minimum rolling interval is set to 1.5 seconds, and the actual rolling interval is set to 1.2 seconds. Through multi-point detection, the actual rolling interval range in the rough and medium rolling areas is 1.0 - 1.4 seconds. When the billet reaches the hot metal detector in front of the No. 2 flying shear, the system detects an abnormal interval (the actual interval at some detection points is less than 1.5 seconds), and automatically triggers the No. 2 flying shear to perform the breaking operation, cutting off the heads of two billets. After breaking, the actual rolling interval at the downstream detection point returns to 1.7 - 1.8 seconds, meeting the action response time of the downstream equipment. The total weight of the billet is 2.64 tons, and the weight of the broken part is 30.76 kilograms. The breaking ratio is only 1.16%, significantly lower than more than 3% of the traditional manual operation. At the same time, the rolling rhythm is not affected, and about 2 minutes of time is saved for each single processing.

[0105] The theoretical minimum rolling interval set for the double high-speed bar production line is 4.2 seconds, and the actual rolling interval is set to 4.0 seconds. The actual rolling interval range detected in the rough and medium rolling areas is 4.0 - 4.4 seconds. When an abnormal interval is detected, the No. 2 flying shear automatically shears off the heads of two billets. After shearing, the downstream rolling interval resumes to 4.7 - 4.8 seconds, fully covering the action response requirements of the downstream loopers and flying shears. The total weight of the billets is 2.64 tons, the sheared weight is 10.85 kg, and the shearing ratio is reduced to 0.82%. The automated control avoids the delay of manual intervention and ensures the continuous and efficient operation of the production line.

[0106] In the wire rod production line, the theoretical minimum rolling interval is set to 7.6 seconds, and the actual rolling interval is set to 7.2 seconds. Multi-point detection in the rough and medium rolling areas shows that the actual interval range is 7.1 - 7.4 seconds. The system triggers the No. 2 flying shear to shear off the heads of three abnormal billets. After shearing, the downstream interval resumes to 8.2 - 8.3 seconds. The total weight of the billets is 2.35 tons, the sheared weight is 20.80 kg, and the shearing ratio is only 0.89%. Compared with the traditional method, the automated shearing shortens the operation time by about 2 minutes, and the shearing amount is accurately controllable, avoiding the risks of excessive cutting or steel piling caused by manual operation errors.

[0107] The above embodiments verify the universality and efficiency of the control method of the present application in different types of production lines (ordinary bars, double high-speed bars, wire rods); through multi-point detection and logical determination, the shearing operation is triggered only when the interval is abnormal and the billet is in place, and the shearing ratio is stable at 0.8% - 1.3%; the automated processing saves about 2 minutes per operation compared with manual operation, improving the production line throughput; the interlock control of the safety distance of the guide groove and the switch completely avoids the risk of steel piling and ensures the stability of the rolling path. Without modifying the existing equipment, the present application realizes the automated closed-loop control of abnormal rolling intervals, providing reliable technical support for the efficient and safe operation of the bar production line.

[0108] Please refer to Figure 3 , which is a schematic structural diagram of a control device for the rolling interval duration of bars provided by an embodiment of the present application, including:

[0109] The rolling data acquisition unit 21 is used to acquire the actual rolling interval duration of each detection point in the rough and medium rolling areas;

[0110] The trigger signal generation unit 22 generates a trigger signal based on the actual rolling interval duration and the preset minimum rolling interval duration;

[0111] The shearing operation execution unit 23 controls the target flying shear to execute the shearing operation based on the trigger signal and the preset rising edge signal;

[0112] The breaking operation stop unit 24 generates a reset signal based on the actual rolling interval duration of the target detection point after breaking and a preset minimum rolling interval duration to control the target flying shear to stop the breaking operation, where the target flying shear is the No. 2 flying shear and the target detection point is the detection point after the target flying shear.

[0113] Please refer to Figure 4 , The embodiment of the present application also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored on the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, the steps of any method for controlling the rolling interval duration of the bar are implemented.

[0114] Since the electronic device introduced in this embodiment is the device used in an apparatus for controlling the rolling interval duration of a bar in an embodiment of the present application, based on the method introduced in the embodiment of the present application, those skilled in the art can understand the specific implementation manners and various variations of the electronic device in this embodiment. Therefore, the specific implementation of how this electronic device implements the method in the embodiment of the present application will not be described in detail here. As long as the device used by those skilled in the art to implement the method in the embodiment of the present application belongs to the scope to be protected by the present application.

[0115] In the specific implementation process, when the computer program 311 is executed by the processor, it can implement any implementation manner in the corresponding embodiment of the first aspect.

[0116] It should be noted that in the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0117] Those skilled in the art should understand that the embodiments of the present application can provide a method, a system, or a computer program product. Therefore, the present application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can be in the form of a computer program product implemented on one or more computer-readable storage media containing computer-readable program code.

[0118] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams can be implemented by computer program instructions, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementing in the process Figure 1one or more processes and / or blocks Figure 1 means for the functions specified in one or more blocks

[0119] These computer program instructions can also be stored in a computer-readable memory capable of guiding a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, and the instruction device implements the processes Figure 1 one or more processes and / or blocks Figure 1 the functions specified in one or more blocks

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one or more processes and / or blocks Figure 1 one or more blocks

[0121] The embodiments of the present application also provide a computer program product, which includes computer software instructions. When the computer software instructions run on a processing device, the processing device is caused to execute Figure 1 the process of a control method for the rolling interval duration of bars in the corresponding embodiment

[0122] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are fully or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that a computer can store, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium, an optical medium, or a semiconductor medium, etc.

[0123] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein

[0124] In several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0125] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0126] In addition, each functional unit in various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware and / or software functional units.

[0127] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device to execute all or part of the steps of the methods in various embodiments of the present application.

[0128] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of various embodiments of the present application.

[0129] Although the preferred embodiments of this specification have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0130] Obviously, those skilled in the art can make various modifications and deformations to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and deformations of this specification fall within the scope of the claims of this specification and their equivalent technologies, this specification is also intended to include these modifications and deformations.

Claims

1. A control method for the interval time of bar rolling, characterized in that, Comprising: Obtaining the actual rolling interval duration of each detection point in the rough and intermediate rolling area; Generating a trigger signal based on the actual rolling interval duration and a preset minimum rolling interval duration; Controlling a target flying shear to perform a breaking operation based on the trigger signal and a preset rising edge signal; Generating a reset signal to control the target flying shear to stop the breaking operation based on the actual rolling interval duration of the target detection point after breaking and the preset minimum rolling interval duration, wherein the target flying shear is the No. 2 flying shear, and the target detection point is the detection point after the target flying shear.

2. The method according to claim 1, wherein The obtaining the actual rolling interval duration of each detection point in the rough and intermediate rolling area includes: Determining the first arrival time of each detection point based on the rising edge trigger point of each detection point in the rough and intermediate rolling area, wherein the detection points include the rack biting point and the hot metal detector point; Determining the second departure time of each detection point based on the falling edge trigger point of each detection point in the rough and intermediate rolling area; Calculating the passing time of the billet at each detection point based on the difference between the first arrival time and the second departure time; Performing an absolute value process on the passing time to determine the actual rolling interval duration of each detection point.

3. The method according to claim 1, characterized in that, The generating a trigger signal based on the actual rolling interval duration and a preset minimum rolling interval duration includes: Comparing the actual rolling interval duration of each detection point with the preset minimum rolling interval duration respectively; When there is at least one detection point whose actual rolling interval duration is less than the preset minimum rolling interval duration, generating a trigger signal.

4. The method according to claim 1, wherein The controlling a target flying shear to perform a breaking operation based on the trigger signal and a preset rising edge signal includes: Determining the breaking start condition of the target flying shear based on the logical relationship between the trigger signal and the rising edge signal of the hot metal detector in front of the target flying shear; Generating a breaking control instruction based on the breaking start condition; Controlling the target flying shear to perform a breaking operation to cut off the head of the billet based on the breaking control instruction.

5. The method according to claim 1, wherein The generating a reset signal to control the target flying shear to stop the breaking operation based on the actual rolling interval duration of the target detection point after breaking and the preset minimum rolling interval duration includes: Comparing the actual rolling interval duration of the target detection point after breaking with the preset minimum rolling interval duration; When the actual rolling interval duration of the target detection point after breaking is greater than the preset minimum rolling interval duration, generating a reset signal; Generating a breaking stop instruction based on the reset signal; Controlling the target flying shear to stop the breaking operation and resume the rolling process based on the breaking stop instruction.

6. The method according to claim 1, wherein It further comprises: Calculating the minimum safe distance from the entrance of the guide groove behind the target flying shear to the center line of the shear blade of the target flying shear according to the line speed, the front slip coefficient and the swing time of the switch of the rolling mill upstream of the target flying shear; If the actual distance between the entrance of the guide groove behind the target flying shear and the center line of the shear blade of the target flying shear is less than the minimum safe distance, keeping the switch in the breaking position until the head of the billet passes through the entrance of the guide groove behind the target flying shear, and then controlling the switch to swing to the rolling position.

7. The method according to claim 6, characterized in that The minimum safe distance is determined based on the following formula, expressed as: L = V·s·t + T cor Wherein, L is the minimum safety distance; V is the linear velocity of the rolling mill upstream of the target flying shear; s is the forward slip coefficient; t is the swing time of the switch; T cor is the preset distance compensation value.

8. A control device for the interval time of bar rolling, characterized in that, Comprising: A rolling data acquisition unit for acquiring the actual rolling interval duration of each detection point in the rough and intermediate rolling areas; A trigger signal generation unit for generating a trigger signal based on the actual rolling interval duration and a preset minimum rolling interval duration; A breaking operation execution unit for controlling a target flying shear to perform a breaking operation based on the trigger signal and a preset rising edge signal; A breaking operation stop unit for generating a reset signal to control the target flying shear to stop the breaking operation based on the actual rolling interval duration of the target detection point after breaking and the preset minimum rolling interval duration, wherein the target flying shear is the No. 2 flying shear and the target detection point is the detection point after the target flying shear.

9. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is configured to implement the steps of the control method for the bar rolling interval duration as described in any one of claims 1 to 7 when executing the computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The computer program, when executed by the processor, implements the control method for the bar rolling interval duration as described in any one of claims 1 to 7.

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